code: def test_protocol(self):
      answer = GeneratedAnswer(
          data="42",
          query="What is the answer?",
          documents=[
              Document(id="1", content="The answer is 42."),
              Document(id="2", content="I believe the answer is 42."),
              Document(id="3", content="42 is definitely the answer."),
          ],
          meta={"meta_key": "meta_value"},
      )
      assert isinstance(answer, Answer)
  
file_path: haystack/test/dataclasses/test_answer.py
imports: from pandas import DataFrame
  from haystack.dataclasses.answer import Answer, ExtractedAnswer, ExtractedTableAnswer, GeneratedAnswer
  from haystack.dataclasses.document import Document
label_desc: Use image node_id 2 for calling the TestGeneratedAnswer obj's underlying member method code with example usage: obj.test_protocol() without return types